Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
256/60r18 vs 33/11.5r18 Tire Comparison Side By Side
  256/60-18 33/11.5-18 Difference
Diameter inches (mm) 30.09 (764.4) 32.94 (836.8) 2.85 (72.4) 9.5%
Width inches (mm) 10.08 (256) 11.5 (292) 1.42 (36) 14.1%
Circum. inches (mm) 94.54 (2401.43) 103.5 (2628.88) 8.95 (227.45) 9.5%
Sidewall Height inches (mm) 6.05 (153.6) 7.47 (189.8) 1.43 (36.2) 23.6%
Revolutions per mile (km) 670.16 (416.42) 612.18 (380.39) -57.98 (-36.03) -8.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.89 mph (35.24 km/h)
25 mph (40.23 km/h)27.37 mph (44.04 km/h)
30 mph (48.28 km/h)32.84 mph (52.85 km/h)
35 mph (56.33 km/h)38.32 mph (61.66 km/h)
40 mph (64.37 km/h)43.79 mph (70.47 km/h)
45 mph (72.42 km/h)49.26 mph (79.28 km/h)
50 mph (80.47 km/h)54.74 mph (88.09 km/h)
55 mph (88.51 km/h)60.21 mph (96.9 km/h)
60 mph (96.56 km/h)65.68 mph (105.71 km/h)
65 mph (104.61 km/h)71.16 mph (114.52 km/h)
70 mph (112.65 km/h)76.63 mph (123.32 km/h)
75 mph (120.7 km/h)82.1 mph (132.13 km/h)
80 mph (128.75 km/h)87.58 mph (140.94 km/h)
85 mph (136.79 km/h)93.05 mph (149.75 km/h)
90 mph (144.84 km/h)98.52 mph (158.56 km/h)
95 mph (152.89 km/h)104 mph (167.37 km/h)
100 mph (160.93 km/h)109.47 mph (176.18 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph)
2.35 2.73 2.94 3.07 3.21 3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 6.17 7.17
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